TB6584AFNG,CSSOP30
TB6584AFNG 为三-相无刷 DC 马达的马达风扇应用而设计.
特征
? 正弦 PWM 控制
? 三角波发生器
(有 fosc/252 Hz 的载波频率)
? 超前角控制 (0° ~ 58° 以 32 独立步)
外部设置或自动内部控制
? 电流-限制输入引脚
? 内部电压稳压器电路 (Vrefout = 5 V (typ.), 30 mA (max))
? 工作供电电压范围: VCC = 6 V ~ 16.5 V
功能描述
1. 基本工作
启动期间, 马达通过根据位置信号产生的方波励磁信号驱动. 位置信号体现 5 Hz 的转速 (f), TB6584AFNG 从位
置信号推断马达位置且调制它们. TB6584AFNG 然后根据三角波形通过比较被调制的信号产生正弦波.
从启动到 5 Hz: 方波驱动 (120° 励磁);_f = fosc/ (212 × 32 × 6)
5 Hz 到: 正弦波 PWM 驱动 (180°励磁);_f 大约为 5.7 Hz 当 fosc = 4.5 MHz 时
2. 电压命令(VSP) 信号和升压调节
(1) Vsp ≤ 1.0 V 时:
励磁信号输出被禁用 (如，门保护被激活).
(2) 1.0 V < Vsp ≤ 2.1 V 时:
低侧励磁信号输出以一定的 (PWM 载波)频率被开启. (传导占空比周期大约 8%.)
(3) 2.1 V < Vsp ≤ 7.3 V 时:
正弦波 PWM 驱动期间, 励磁信号直接外部显示. 正弦波驱动期间, 低侧励磁信号输出以一定的 (PWM 载
波)频率被强制开启. (传导占空比大约 8%.)
(4) 8.2 V ≤ Vsp ≤ 10 V (测试模式)时:
TB6584AFNG 在正弦波驱动模式下用零的超前角驱动. 然而, 其在正弦波模式下驱动以检测反转.
Vsp 到达 7.9 V (typ.)时, 超前角切换为零.
PWM 占空比被计算为 PWM_carrier_frequency × 92%_(typ.) 且保持恒定值 (5.4 V≤ Vsp (typ.)).
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